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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23a9fc5ee14e482fcd1536d31a42e4aa18799044710bbcdd2c02df18520cbf8' 
  AND token = '681KZEmWrLxJlu9Rrk8S2cLgo7I391vuPrQesNUU3Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}